Dynamo-electric generator.



G. & L. INRIG.

DYNAMO ELECTRIC GENERATOR.

APPLICATION FILED JAN. 20. m4.

Patented Aug. 10, 1915.

UNITED STATES PATENT @FFICE.

GAVAN INRIG AND LEON INRIG, OF :IONDON, ENGLAND.

DYNAMO-ELECTRIC GENERATOR.

Continuation of application Serial No. 701,608, filed June 4, 1912. Thisapplication filed J Y Serial No. 813,211.

To all whom it may concern Be it known that we, GAVAN INRIG and LEONINRIG, subjects of the King of Great Britain, residing at 154Bishopsgate, London, in the county of Middlesex, England, have inventedcertain new and useful Improvements in Dynamo-Electric Generators; andwe do declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

This invention relates to improvements in the construction and design ofelectric generators, adapted to be used in connection with accumulatorsunder conditions where the speed is variable, such as car axles orautomobile engines, and has for its object a new and improved means formaintaining a constant voltage under. all speeds.

The present application is a continuation of our application filed June4, 1912, Serial No. 701,608.

The manner in which the above object is attained and the mode ofprocedure and the construction is fully described and illus trated inthe following specification and in the accompanying drawings, of whichFigure 1 is a longitudinal mid-sectional view of the generator; Fig. 21s a cross-sec tion of the armature core on the line a-a of Fig. 1; andFig. 3 is a view of the cylinder which supports the outer armature.

In the drawings herewith, all the working details are shown in thelongitudinal halfsection. I

The spindle F is mounted on ball bearings in the ordinary manner.

A designates the commutator; B the carbon box brushes; C a ring securedto the brush holders for carrying the brushes; D a head splined to thespindle and to which is attached the cylinder K on which the armature Jis mounted which may consist of the usual laminae. To prevent thecylinder K acting as a short circuiting armature, the said cylinder isprovided with a plurality of longitudinal slots K as is shown in Fig. 2,thereby preventing the armature heating to an unallowable extent andmasking out a large part of the magnetic flux which would otherwisereach the Specification of Letters Patent.

Patented Aug. 10, 1915.

anuary 20, 1914.

inner armature core. The commutator and the armature both revolve withthe spindle.

E designates the field coils;

H is a brass sleeve splined to the spindle by a feather acting as asupport for thefoverhung arma-- ture.

M designates the core of the field magnets; N a brass socket membersuitably attached to the tube H and carrying one end of' the governorlinks S, the other end of said links being carried by a collar R fittedto the spindle and rotating therewith, and sliding thereon to the extentof the slot 6 in the spindle which receives apin a on the collar. p

P designates the governor balls carried by the links; 0 a spiral springagainst which the governor works.

(i is a switch lever pivoted to the adjacent end of the shell or casing,one end of which is bifurcated to straddle the spindle at which point itis inclosed between the end of the casing and a space filler or washero. The other end of the switch lever 03 carries a contact point e whichcooperates with a fixed contact point 7 in closing and opening thecircuit. A spring 9 exerts a force to close the circuit at such timeswhen the collar R releases the lever d through the action of thegovernor.

The machine, when running at normal speed, is the same as any dynamohaving the well known types of winding and will give its predeterminedvoltage at normal speed. \Vhen, however, the speed increases, the ballgovernor draws the armature core I along the spindle arid out of thecylinder K, initially closing the switch points, thereby increasing theair space, and thus cutting off a number of the magnetic lines offorcepassing through the armature and so preventing any increase involtage. As the speed decreases, the spring 0 overcomes the centrifugalforce of the balls and pushes the armature core back into the cylindercarrying the coils, and separates the contact points 6 and f. Thearmature core, as shown in the drawing, is slightly tapered at one end.By building the armature core in this manner, the voltage is keptconstant with a smaller lateral motion than if the armature core were atrue cylinder. When the speed has increased so as to bring the governorto the position shown by the dotted lines, on the drawing, the currenthas been reduced to a minimum, as the air gap between the coils and thearmature core is too great to allow of the passageof an appreciablenumber of lines of force. The cylinder K, carrying the armature coils isnecessarily made of very thin metal, and requires the support of thearmature from the inside to keep it true and in position. The armaturecore itself being tapered at one end, the cylinder would lose itssupport at high speeds when it is most required. This difficulty isovercome by the guides L hereinbefore re ferred to.

Having described our invention, we claim:

1. A dynamo, electric generator having its armature in two separate anddistinct portions, one portion being fixed to the spindle and rotatingtherewith, said portion carrying the coils, the other portion being the.

core which rotates with the spindle and is free to move in and out ofthe coils, and a governor controlling said core.

2. In a dynamo electric machine, an armature, a movable core for saidarmature, and

ernor adapted to movesaid core and to thereby increase or decrease themagnetic reluctance of the armature.

In testimony whereof we afliX our signatures, in presence of twowitnesses.

GAVAN INRIG. LEON INRIG.

' Witnesses:

THOMAS WALTER PRICE, JAMES MARTIN MURPHY.

